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ModifyToCreateThingTransformer.java
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ModifyToCreateThingTransformer.java
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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.things.service.enforcement;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import org.eclipse.ditto.base.model.signals.Signal;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.policies.enforcement.pre.ExistenceChecker;
import org.eclipse.ditto.policies.enforcement.pre.PreEnforcer;
import org.eclipse.ditto.things.model.signals.commands.modify.CreateThing;
import org.eclipse.ditto.things.model.signals.commands.modify.ModifyThing;
import akka.actor.ActorSystem;
/**
* Transforms a ModifyThing into a CreateThing if the thing does not exist already.
*/
public final class ModifyToCreateThingTransformer implements PreEnforcer {
private final ExistenceChecker existenceChecker;
ModifyToCreateThingTransformer(final ActorSystem actorSystem) {
this.existenceChecker = ExistenceChecker.get(actorSystem);
}
@Override
public CompletionStage<Signal<?>> apply(final Signal<?> signal) {
if (signal instanceof ModifyThing modifyThing) {
return existenceChecker.checkExistence(signal)
.thenApply(exists -> {
if (Boolean.FALSE.equals(exists)) {
final JsonObject initialPolicy = modifyThing.getInitialPolicy().orElse(null);
final String policyIdOrPlaceholder = modifyThing.getPolicyIdOrPlaceholder().orElse(null);
final var newThing = modifyThing.getThing().toBuilder()
.setId(modifyThing.getEntityId())
.build();
return CreateThing.of(
newThing,
initialPolicy,
policyIdOrPlaceholder,
modifyThing.getDittoHeaders()
);
} else {
return modifyThing;
}
});
} else {
return CompletableFuture.completedStage(signal);
}
}
}